Enhanced sound absorption performance of porous ceramics with closed-pore structure

Lou, Jiayi; He, Chao; Shui, Anze; Yu, Hulei

doi:10.1016/j.ceramint.2023.09.140

Cited by 10 publications

(1 citation statement)

References 50 publications

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“…Based on the principle of dissipating sound energy, sound-absorbing materials can mainly be divided into four categories: porous material [1], (micro-)perforated plate, metamaterial [2], and a hybrid type [3]. Among these, porous materials offer advantages such as a larger absorption bandwidth, cost-effectiveness, and space efficiency, making them highly promising for practical applications [4][5][6]. However, given the inadequacy of existing porous sound absorption materials in terms of sustainability, a green and highly efficient acoustic absorptive material is still actively being explored.…”

Section: Introductionmentioning

confidence: 99%

Effects of Freeze-Drying Processes on the Acoustic Absorption Performance of Sustainable Cellulose Nanocrystal Aerogels

Ruan,

Xie,

Wan

et al. 2024

Gels

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Cellulose aerogels have great prospects for noise reduction applications due to their sustainable value and superior 3D interconnected porous structures. The drying principle is a crucial factor in the preparation process for developing high-performance aerogels, particularly with respect to achieving high acoustic absorption properties. In this study, multifunctional cellulose nanocrystal (CNC) aerogels were conveniently prepared using two distinct freeze-drying principles: refrigerator conventional freezing (RCF) and liquid nitrogen unidirectional freezing (LnUF). The results indicate that the rapid RCF process resulted in a denser CNC aerogel structure with disordered larger pores, causing a stronger compressive performance (Young’s modulus of 40 kPa). On the contrary, the LnUF process constructed ordered structures of CNC aerogels with a lower bulk density (0.03 g/cm3) and smaller apertures, resulting in better thermal stability, higher diffuse reflection across visible light, and especially increased acoustic absorption performance at low–mid frequencies (600–3000 Hz). Moreover, the dissipation mechanism of sound energy in the fabricated CNC aerogels is predicted by a designed porous media model. This work not only paves the way for optimizing the performance of aerogels through structure control, but also provides a new perspective for developing sustainable and efficient acoustic absorptive materials for a wide range of applications.

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Section: Introductionmentioning

confidence: 99%

Effects of Freeze-Drying Processes on the Acoustic Absorption Performance of Sustainable Cellulose Nanocrystal Aerogels

Ruan,

Xie,

Wan

et al. 2024

Gels

View full text Add to dashboard Cite

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Tailored directional porosity in ceramic matrix composites (CMCs) for hypersonic applications

Kessel,

Friess,

Rauh

et al. 2024

CEAS Space J

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In the field of hypersonic systems and their missions, the occurring flows impose extreme mechanical and thermal loads on the materials used. At the German Aerospace Center (DLR), extensive research is conducted in this area, ranging from design and specification to the development of suitable materials concluding with the proof of concept under realistic conditions in wind tunnels. In recent years, ceramic matrix composites (CMCs) have been investigated for specific aspects of hypersonics. These materials exhibit consistent mechanical behavior over a wide temperature range (up to 1600 °C), coupled with high damage tolerance and thermal shock resistance, distinguishing them from metals and superalloys. Particularly, special porous C/C–SiC ceramics (carbon-fiber-reinforced carbon with silicon carbide) enable innovative material applications for components in transpiration cooling, fuel injection, or boundary-layer transition control. The work presented focuses on the next generation of porous C/C–SiC ceramics currently in development. By deliberately modifying the textile preform, the resulting microstructure and pore morphology are influenced, allowing for control over both the total volume and the orientation of the pores. Relevant parameters influencing porosity have been determined based on the results, and an initial characterization has been conducted. It has been demonstrated that there is a preferred direction of porosity within the sample thickness (Z-axis), and in terms of hypersonic-relevant properties, an absorption coefficient of 0.58 for an acoustic wave at 500 kHz (static pressure of 15 kPa), as well as a length-specific flow resistance of 3.4 MPa s/m2 and an overall porosity of 12.25% were determined. Building upon these promising initial findings, the goal is to further expand the understanding of the parameters influencing porosity and to generate a tailored material for different application scenarios by correlating them with hypersonic properties.

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The prediction of sound absorption coefficient of film multi-cavity materials based on generalized regression neural network (GRNN)

Zhang,

Hou

et al. 2024

Applied Acoustics

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Enhanced sound absorption performance of porous ceramics with closed-pore structure

Cited by 10 publications

References 50 publications

Effects of Freeze-Drying Processes on the Acoustic Absorption Performance of Sustainable Cellulose Nanocrystal Aerogels

Effects of Freeze-Drying Processes on the Acoustic Absorption Performance of Sustainable Cellulose Nanocrystal Aerogels

Tailored directional porosity in ceramic matrix composites (CMCs) for hypersonic applications

The prediction of sound absorption coefficient of film multi-cavity materials based on generalized regression neural network (GRNN)

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